84 Crossfire Injection
Melting Slicks
Joined: Jan 2008
Posts: 2,065
Likes: 1
From: Jasper Texas
Wait a second, can you really do this?? The 85+ pumps were much higher pressure, that wouldn't cause a problem with the fuel pressure regulator or the rubber fuel lines of the '84!?
Drifting
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
There is quite a queue for these apparently. Mine hasn't been born yet. The foundry is expected to give birth sometime around end of November. I think as a guess January.
Drifting
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
In the picture, in front of the fan there is the radiator housing. Directly front of that is the air box. Notice the square hole in the air box. Also, notice the the hood meets the air box and the hole in the hood used to draw air. When the hood closes the the hole in the hood is directly over the hole in the air box drawing cold air. Normally '84s don't have that hole in the air box cutting off the air when the hood is closed. Really noticeable at wide open throttle (WOT).
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Pro
Joined: Apr 2003
Posts: 552
Likes: 13
From: Oz
The pressure remains unchanged, it is controlled by the regulator, not the pump.
The 85 pump has increased capacity, resulting in stable fuel pressure, where a tired 84 pump may not keep up at times.
My car was the same when I bought it and would barely run over ~20% throttle.
Lemme: If you need to do this, just grab a pump for a 6cyl VN Commodore, this is what I have been using for the last 8yrs without issue.
Drifting
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
The pressure remains unchanged, it is controlled by the regulator, not the pump.
The 85 pump has increased capacity, resulting in stable fuel pressure, where a tired 84 pump may not keep up at times.
My car was the same when I bought it and would barely run over ~20% throttle.
Lemme: If you need to do this, just grab a pump for a 6cyl VN Commodore, this is what I have been using for the last 8yrs without issue.
The 85 pump has increased capacity, resulting in stable fuel pressure, where a tired 84 pump may not keep up at times.
My car was the same when I bought it and would barely run over ~20% throttle.
Lemme: If you need to do this, just grab a pump for a 6cyl VN Commodore, this is what I have been using for the last 8yrs without issue.
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
Originally Posted by Lemme
Why did they design an airbox where the air can't get through to the intake?
Can anyone show us some improved performance specs because of this mod, or is it all theory?
Drifting
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
It is pretty common in road race cars to suck cold air in from the front air dam close to the road surface. It obviously works. These cars run in the rain and run through sand pits without any major issues.
However, I think the air filter is at the front rather than back at the intake manifold.
So maybe it would be better to mount a panel filter in the cutout airbox and remove the one back at the aircleaner. Also it would work better/cleaner if the vette had air rammed in from the front where the licence plate is rather than sucking from underneath.
Another option could be a Hydro-shield pre-filter:
'"This durable polyester cover repels water while still allowing a free-flow of oxygen. The secret behind the Hydro Shield’s amazing success stems from its water repellent outer coating. It’s crafted using a sophisticated embedded hydrophobic process, which creates uniform rows of micron-sized pores. These openings filter out water and debris .005” or larger!You don’t have to worry about choking your engine, though. The Hydro Shield purifies the oxygen while still allowing steady airflow—and consistent airflow means rip-roaring horsepower and massive torque."
For me I don't intend driving on dirt tracks or in the rain.
However, I think the air filter is at the front rather than back at the intake manifold.
So maybe it would be better to mount a panel filter in the cutout airbox and remove the one back at the aircleaner. Also it would work better/cleaner if the vette had air rammed in from the front where the licence plate is rather than sucking from underneath.
Another option could be a Hydro-shield pre-filter:
'"This durable polyester cover repels water while still allowing a free-flow of oxygen. The secret behind the Hydro Shield’s amazing success stems from its water repellent outer coating. It’s crafted using a sophisticated embedded hydrophobic process, which creates uniform rows of micron-sized pores. These openings filter out water and debris .005” or larger!You don’t have to worry about choking your engine, though. The Hydro Shield purifies the oxygen while still allowing steady airflow—and consistent airflow means rip-roaring horsepower and massive torque."
For me I don't intend driving on dirt tracks or in the rain.
Last edited by Lemme; Nov 1, 2010 at 07:48 AM.
Drifting
Joined: Jan 2006
Posts: 1,372
Likes: 2
From: Ramona CA
I marked the spot and used a Dremmel Moto drill. As far as the '85 FP goes. It produces a steady 56 psi to the FPR. The FPR should produce a STEADY 14 psi to the TBs. Not 13.8 or 13.9 but 14 PSI. No more hesitations - GONE. The '84 FP produces 19 PSI - a weak POS.
